<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div>div标签</div>
    <!-- html提供得所有标签本质就是布局标签通过不同页面效果提供得视觉区分 -->
    <h1>标题标签</h1>
    <h2>标题标签</h2>

    <hr>

    <span>span标签</span>
    <strong>加粗标签</strong>
</body>
</html>